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Income Taxes Unrecognized Tax Benefits Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Unrecognized Tax Benefits, Beginning $ 3,570 $ 4,610
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions 250 120
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions 860 80
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions (100) (10)
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities 0 0
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations (1,210) (1,230)
Unrecognized Tax Benefits, Ending $ 3,370 $ 3,570